QUATERNARY GLACIAL CHRONOLOGY IN QINGHAI-XIZANG PLATEAU
青藏高原若干地点的第四纪冰川年代学* ——深切怀念孙殿卿院士

There are typical moraines in four areas in the Qinghai-Xizang Plateau. We obtained data of the moraines age through surface exposure age dating. Three glaciations have been recognized near the Nielamu County, in subsequence formed during 51.7 - 93.7kaB. P., 113.5 - 203.4kaB. P., and 268. 1 - 321. 5kaB. P. Older glaciation in Xixiabangma and Nieniexiongla are believed to exist near the county. The exposure age dating of glacial erratic boulders confirms two glaciations in Tanggula, and the ages are about 70.5kaB. P. and 162.3 - 210.0kaB. P. By the analysis of geological and morphologic features, an older moraine in the high terrace, south to the Tanggula is discovered. The exposure age dating of glacial boulders in Haizishan and Zheduoshan confirms the last glaciation, the Heinrich Event 1, and the Younger Dryas. Based on geological and morphologic features of the highest terrace boulder in Haizishan, the exposure age might be younger than the actual one. Although we have obtained this first set of data of exposure ages of moraines in the plateau, the temporal and spatial frame of the Quaternary glaciations in the plateau is not yet known completely. With dating of moraine in more places in the plateau, we hope to understand Quaternary glaciations in this region better, which will play important role in the PAGES.